How to Repair a Garden Fence After Storm Damage

Storm damage to garden fences is one of the most common calls to UK tradespeople every winter. Between January gales, February fronts and the occasional summer storm, British fences take a battering year after year. The good news is that most storm damage is repairable rather than requiring a full replacement — if you act quickly and methodically. This guide covers how to assess damage, replace broken posts and panels, and make repairs that will actually hold up rather than fall over at the next storm.

Safety First: Before You Touch Anything

After a storm, don't just wade into the garden and start lifting. A few safety checks first:

• Check for any overhead cables — telegraph wires or electricity cables — that may have fallen near the fence. If in doubt, contact your electricity distributor (not 999) before approaching.
• Inspect the fence for any nails or screws that are now sticking out at dangerous angles.
• Check for any panels that are hanging precariously — these can swing in a light breeze and cause injury. Prop them or tie them off before examining the posts.
• If a panel has fallen onto the neighbour's side, knock and let them know before you start work.

Assessing the Damage: Posts vs. Panels

The nature of storm damage usually falls into one of three categories, and your repair approach differs significantly depending on which you're dealing with.

Fallen or snapped fence panels

If the posts are still standing and solid but panels have blown out or broken, you're in luck. This is the simplest repair. Standard panel sizes in the UK are 1.83m (6ft) wide, and heights run from 0.9m to 1.83m in 0.3m increments. You can buy replacement featherboard panels from B&Q, Wickes or Screwfix for £20–£60 depending on style and height. Closeboard panels (individual feather-edge boards) are sturdier than overlap panels and better at withstanding wind.

Leaning or wobbly posts

A leaning post usually means the concrete at the base has failed, or the post itself has rotted just below ground level — the classic failure point for wooden fence posts. Poke the base with a screwdriver: if it sinks in easily, the wood has rotted and you'll need a new post.

Snapped posts

Posts that have snapped are almost always rotten. A healthy post under normal UK storm conditions simply bends; it doesn't snap cleanly. This means the damage was waiting to happen and the repair needs to be thorough.

Replacing a Fence Post: The Right Way

Replacing a post is the most labour-intensive part of fence repair, but it's what determines whether your repair survives the next storm. Cutting corners here means the fence comes down again.

Option 1: Concrete post spurs

Post spurs (also called repair spurs or AKA spurs) are short concrete or steel extensions that bolt to the sound section of the existing post above ground while the new spur goes into the ground. This avoids digging out the old concrete base. Titan Post Spurs from Screwfix cost around £12 each and are a popular DIY choice for mild lean rather than complete post failure.

Method: Dig down 300–400mm beside the existing post base, insert the spur, fill with Postcrete (pour dry, add water, done in 10 minutes), bolt to the post once set.

Option 2: Full post replacement

For posts that have snapped or are severely rotten:

1. Dig out the old post and concrete base. Use a post hole digger or hire a post hole borer from HSS Hire (around £40/day). You need to go down at least 600mm — a third of the post height plus 150mm. For a 1.8m fence, that means at minimum 750mm depth. In clay soils, go deeper.
2. Choose treated timber. UC4 pressure-treated green timber posts are the minimum standard for ground contact. 100mm × 100mm posts are standard for panel fencing in the UK. Avoid untreated timber — it will rot within five years.
3. Set the post with Postcrete. One 20kg bag of Postcrete (around £6 at B&Q) per post. Tamp the gravel in the base of the hole first for drainage, insert the post, check plumb in both directions with a spirit level, then pour Postcrete around the post dry and slowly add water. Brace the post with temporary support (scrap timber wedged between post and a stake) while it sets — allow two hours before applying any load.
4. Alternatively, use a fence post spike. AKA bolt-down or driven spikes (£8–£15 each from Wickes). These work well in firm ground but are not recommended for clay soils or exposed coastal locations where the fence is under significant wind load.

Repairing or Replacing Fence Panels

Removing damaged panels

Most UK panel fences use panels slotted between concrete or timber posts with the panel held by the post groove, gravity and often a few galvanised nails. To remove a damaged panel: pull any nails, lift the panel up out of the bottom groove, then tilt and pull out of the top groove. It sounds simple; on older installations with years of paint or treatment it can take considerable force. A pry bar is your friend here.

Installing new panels

1. Check that the post spacing matches your panel width. Standard UK fence posts are spaced 1.83m apart centre-to-centre for standard panels. Even a 20mm discrepancy means the panel won't seat properly.
2. If the gap is too wide due to a new post being set slightly differently, fit panel clips (galvanised L-brackets) to the post face to hold the panel.
3. Tilt the panel into the top groove first, then swing the bottom into position. It should slot in with a firm push.
4. Secure with galvanised nails or screws through the panel frame into the post. Use 75mm galvanised nails minimum — stainless steel are better in coastal areas.
5. Fit a gravel board (a 150mm × 38mm treated timber board) along the base to keep the panel off the soil. This single addition can double the lifespan of a fence panel.

Repairing individual featherboard slats

If you have a closeboard fence (individual overlapping boards nailed to arris rails rather than complete panels), you can replace individual broken boards. Featherboard timber (125mm × 11mm tapered) is available from builders merchants and Screwfix. Nail through the board into the arris rail with 40mm ring-shank galvanised nails for the best grip.

Treating and Protecting the Repaired Fence

Any new timber you've introduced needs treating immediately. Don't leave it bare — exposed bare timber will grey within months and start absorbing moisture.

• Fence paint and stain: Cuprinol Garden Shades and Ronseal Fence Life are the two most popular UK fence treatments. Ronseal Fence Life Plus+ contains a fungicide and insecticide and is worth the extra cost for posts. Apply two coats, making sure to coat cut ends thoroughly — this is where moisture ingresses first.
• Post tops: Fit post caps to all post tops. Water pools on flat post tops and accelerates rotting. Wooden post caps cost pennies at any B&Q; metal galvanised caps last longest.
• Arris rail brackets: If any arris rails (the triangular horizontal rails on closeboard fences) are failing at the mortise joint, reinforce with galvanised arris rail brackets rather than replacing the rail entirely.

Neighbour Disputes and Boundary Questions

Before you start any significant repair work, it's worth checking whose fence it legally is. In the UK there is no universal rule — ownership is determined by your title deeds or the transfer documents. Look for a 'T' mark on the boundary plan: the fence belongs to the property on the upright side of the T. If you're unsure, the Land Registry can provide title plan copies for £3 online.

You are not legally required to repair a fence you own if it falls into disrepair — there's no general legal duty to fence — but if a damaged fence causes damage to your neighbour's property, you could be liable. More practically, talking to your neighbour before starting work avoids most disputes.

Common Mistakes to Avoid

• Setting posts too shallow: The most common reason fences blow over. In the UK, for a 1.8m fence, posts need to be at least 600mm in the ground — ideally 750mm.
• Using untreated or wrong-grade timber: UC4 treatment for ground contact, UC3b for above-ground external use. Using UC2 (interior grade) timber for fence posts is a waste of money.
• Not using gravel boards: Panels sitting directly on soil wick moisture and rot within two to three years.
• Setting posts in pure concrete: Pack gravel in the base of the hole first. It aids drainage and stops the post sitting in standing water.
• Replacing like-for-like without addressing the root cause: If a post snapped in a modest gale, examine why. Was the fence too exposed? Consider adding an additional intermediate post or swapping solid panels for trellis panels that let wind through.

Summary

Repairing a storm-damaged garden fence is well within DIY reach if you approach it methodically. Assess whether you're dealing with a post or panel problem first — the repair approach is completely different. For posts, go deep and use Postcrete properly; for panels, check post spacing and fit gravel boards. Treat all new timber immediately and fit post caps. Done correctly, a repaired fence should outlast a brand-new replacement that's been hastily slotted in without proper foundations.